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Vpliv geometrije heterogenih preizkušancev na identifikacijo parametrov anizotropnih materialnih modelov
ID Godeša, Janez (Author), ID Starman, Bojan (Mentor) More about this mentor... This link opens in a new window, ID Halilovič, Miroslav (Comentor)

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Abstract
Anizotropni kriterij tečenja YLD2000-2D za popis plastičnega odziva pločevin zahteva določitev devetih materialnih parametrov. Ker posamezen standardni mehanski preizkus ne zagotavlja dovolj informacij za njihovo zanesljivo identifikacijo, se vse pogosteje uporabljajo heterogeni preizkušanci v okviru Materialnega testiranja 2.0 (MT 2.0). V magistrskem delu je bilo razvito avtomatizirano numerično okolje za vrednotenje primernosti različnih geometrij preizkušancev za identifikacijo parametrov modela YLD2000-2D. Z uporabo programskega paketa Abaqus in programskega jezika Python so bili analizirani različni enoosno in dvoosno obremenjeni preizkušanci. Njihova primernost je bila ovrednotena na podlagi občutljivosti odziva na spremembe materialnih parametrov, medsebojne korelacije parametrov in pogojenosti občutljivostnih matrik. Rezultati kažejo, da enoosno obremenjeni preizkušanci izkazujejo izrazite razlike v občutljivosti posameznih parametrov, medtem ko dvoosno obremenjeni preizkušanci vzpostavijo informacijsko polnejša napetostno-deformacijska stanja. Med obravnavanimi konfiguracijami je prečno obremenjeni preizkušanec izkazal najugodnejše pogoje za identifikacijo vseh obravnavanih parametrov, vključno z eksponentom kriterija tečenja.

Language:Slovenian
Keywords:konstitutivni model, materialno testiranje 2.0, parametrična analiza, identifikacija materialnih parametrov, plastična anizotropija
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FS - Faculty of Mechanical Engineering
Place of publishing:Ljubljana
Publisher:[J. Godeša]
Year:2026
Number of pages:XX, 67 str.
PID:20.500.12556/RUL-187301 This link opens in a new window
UDC:539.374:620.1(043.2)
COBISS.SI-ID:291100931 This link opens in a new window
Publication date in RUL:10.09.2026
Views:111
Downloads:39
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Secondary language

Language:English
Title:Analysis of heterogeneous specimen geometries on identification of anisotropic material model parameters
Abstract:
The anisotropic YLD2000-2D yield criterion for describing the plastic response of sheet metals requires the determination of nine material parameters. Since a single standard mechanical test does not provide sufficient information for their reliable identification, heterogeneous specimens are increasingly used within the framework of Material Testing 2.0 (MT 2.0). In this master’s thesis, an automated numerical environment was developed to evaluate the suitability of different specimen geometries for the identification of YLD2000-2D model parameters. Using the Abaqus software package and the Python programming language, various uniaxially and biaxially loaded specimens were analysed. Their suitability was assessed based on the sensitivity of the response to changes in the material parameters, the mutual correlation between parameters, and the conditioning of the sensitivity matrices. The results show that uniaxially loaded specimens exhibit pronounced differences in the sensitivity of individual parameters, whereas biaxially loaded specimens generate more information-rich stress–strain states. Among the considered configurations, the transversely loaded specimen provided the most favourable conditions for identifying all investigated parameters, including the exponent of the yield criterion.

Keywords:constitutive model, material testing 2.0, parametric analysis, identification of material parameters, plastic anisotropy

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